Due to the wide variety of devices available and potential variations in their firmware, the information presented below may or may not be accurate. For this same reason, OpenDNS support will generally not be able to provide device-specific assistance beyond what is provided below. If you need further assistance specific to your device, please contact either the manufacturer's support team, or your ISP if you are using leased equipment.
Original Manual: ftp://ftp.zyxel.com/P-660HN-51/user_guide/P-660HN-51_1.1_ed1.pdf
Step 1: Type the IP address 192.168.1.1 in your browsers address bar, then log in as an admin.
Step 2: Click on Network Settings -> Broadband to open your existing connections, the click on the pen and paper icon under Modify
Step 3: On the next page, scroll down until you see DNS Server. Set the DNS to STATIC and enter the IP addresses:
Step 4: To ensure that OpenDNS is working properly for you, please flush your browser and DNS cache by following the instructions below: